We are manufacturer of gold refining machine, silver refining machine and supplier of this system in India and all over the world. Being one of the leading manufacturer and exporter of gold refinery machine, we have a huge vendor base who supply high quality raw material for the manufacture of these system.
Keeping in mind the needs and specifications of our clients, we also offer a wide range of these machinery in various customized forms.
Gold Refinery Machine Includes
- Dissolution Reactor
- Precipitation Reactor
- Gold Filtration Unit
- Glass Coolers For Acid Flumes
- PTFE Agitator Assembly
- Hno3/ HCL Acid Charging System
- Flange & PTFE Gasket and SS Nut bolts
- Scrubber Nitrous Fumes Neutralization With Tank & Pump
- Glass Washing Scrubber For Fumes
- Electrical Panel With VFD / On Off Switches
- Platinum Reactor
Gold refining machine is highly capable to furnish absolute quality gold. It is assembled by using premium quality components under the guidance of our skilled experts as per international market norms. Our machine is used by gold smith for removing gold from concentrates of black sand.
Apart from this, our offered machine is easy to install and maintain. Gold refining machine is best suitable for gold and silver and is known for its longer service life, smooth functioning and seamless finishing.
This system shown above is able to treat from 300 gram. to 5 kg. of raw material. You can get up to 99.99% pure gold (Au) in a single step within a production cycle that can last from 5 to 8 hours, from the preparation of the grains, to obtaining the pure ingot.
The treatment takes place by dissolving the raw metal alloy through the use of the so-called “Aqua Regia” process, an opportunely calibrated mixture of hydrochloric acid (HCl) and nitric acid (HNO3).
The Aqua Regia Process
Our system work on the basis of Aqua Regia Process. In Aqua regia process the Gold (AU) should not be less than 65% and Silver (AG) should not be more than 10%.
The process involves to dissolve gold in Aqua regia ( Acid+Water Mixture ).Silver will form Silver chloride precipitates, which will be filtered out.
The filtered solution is treated with a Reducing agent Sodium Meta Bisulfite, and precipitates Gold, which is filtered, washed , dried and usually melted and granulated.
Inquartation Procedure
The most used refining technique is based on chemical method whereby the gold- bearing scrap is dissolved in aqua regia (HNO3 + HCl). The aqua regia refining technique efficiently works with alloys that respect the contents of silver less then 10%.
The silver percentage in the alloy represents a critical value to be considered in order to use the aqua regia refining technique.
A high silver concentration, indeed, may block the reaction due to the exceeded amount of AgCl formed during the chemical attack.
An alternative method for gold refining applied to high silver content alloys is the “inquartation procedure. Inquartation involves initially diluting the gold in the refinable material to about 25% (literally ‘quartering’ the gold) by melting with the appropriate addition of copper or silver, then treating with nitric acid.
The acid will dissolve the silver and base metals, leaving behind the gold. The acid treatment is known as parting as it ‘parts’ (separates) the gold from the silver and base metals.
Dilution of the gold content is necessary to ensure that the nitric acid can readily attack and dissolve the base metals and silver, some of which may be otherwise masked by the gold.
